Consolidation-Driven Defect Generation in Thick Composite Parts
Consolidation-Driven Defect Generation in Thick Composite Parts
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DOI：
10.1115/1.4039555
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发表时间：
2018-07-01
影响因子：
4
通讯作者：
Hallett, S. R.
中科院分区：
文献类型：
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作者：
Belnoue, J. P. -H.;Nixon-Pearson, O. J.;Hallett, S. R.
纤维波纹是复合材料中出现的最重要的缺陷之一，因为它会导致机械性能的严重下降。本文研究了复合材料预浸料加工过程中纤维路径缺陷产生的机制，并提出了新的预测数值模型。这项工作的一个关键焦点是厚截面，其中层板堆叠的固结导致平面外层板运动。这种变形要么直接导致纤维波纹，要么导致层中纤维长度过长，进而导致皱纹的形成。这种新颖的预测模型基于小规模压实测试中预浸料的广泛表征，在有限元软件 ABAQUS 中作为定制的用户定义材料实施。研究了许多工业相关的案例研究，以证明典型组件特征中缺陷的形成。经过验证的数值模型用于扩展从制造试验中获得的理解，以隔离各种材料、几何和工艺参数对缺陷形成的影响。
Fiber waviness is one of the most significant defects that occurs in composites due to the severe knockdown in mechanical properties that it causes. This paper investigates the mechanisms for the generation of fiber path defects during processing of composites prepreg materials and proposes new predictive numerical models. A key focus of the work was on thick sections, where consolidation of the ply stack leads to out of plane ply movement. This deformation can either directly lead to fiber waviness or can cause excess fiber length in a ply that in turn leads to the formation of wrinkles. The novel predictive model, built on extensive characterization of prepregs in small-scale compaction tests, was implemented in the finite element software ABAQUS as a bespoke user-defined material. A number of industrially relevant case studies were investigated to demonstrate the formation of defects in typical component features. The validated numerical model was used to extend the understanding gained from manufacturing trials to isolate the influence of various material, geometric, and process parameters on defect formation.